My opinion is, it's more popular around teens/adults who grew up with it and had Pokemon in their childhood.

I can agree to that, but I also think that kids today find it (the games) popular is because it was popular. It's kind of a perception thing. The genre is so spread out and well known that it brings with it; it's own hype. So because older kids/adults even are over-joyed about a new game younger kids see that and automatically sense that it's gonna be good and therefore brings interest from the younger generation.

It's hard to put into words what I'm trying to say but I'm giving it a shot.